B18C swap

if i bought a OBD1 JDM B18C gsr, would i need a USDM GSR wiring harness? I heard a 92-95 civic ex/si harness will do. The car is a 94 civic dx hatch. Will the civic mount bolt the GSR? (i know i have to wire VTEC and Knock)

The IAB i heard, can be vaccuumed off somewhere, so it'll eliminate the secondary butterflies to function and get vtec better? how would i do that?